Helicone.ai is an open-source platform designed to provide observability for developers working with large language models (LLMs). It offers tools for logging, monitoring, and debugging, ensuring that developers can maintain and optimize their LLM-powered applications effectively. With industry-leading query times and sub-millisecond latency impact, Helicone is built to handle real production workloads, processing up to 1,000 requests per second and logging over 1.2 billion total requests.